removeWhere method

void removeWhere (bool test(V element))
override

Removes all elements of this set that satisfy test.

Implementation 

void removeWhere(bool test(V element)) {
  var toRemove = [];
  _baseMap.forEach((key, value) {
    if (test(value)) toRemove.add(key);
  });
  toRemove.forEach(_baseMap.remove);
}